"Just as this website explains above, comet goldfish require filtration and aeration just like other aquarium fish. They shouldn't be kept in bowls. A full grown comet will require a minimum of a 30 gallon tank. Even a small 1 inch goldfish shouldn't be kept in anything smaller than 2 gallons, and that's for only one comet TEMPORARILY! If you're really wanting to keep a fish in a bowl, I would recommend a betta. Although they actually prefer a warmer temperature (78-82 degrees F), they usually live at room temperature with no problem. They will not require filtration as long as you change out the water once weekly (make sure you are using "conditioned" tap or well water or spring water, and make sure it is at about room temperature so as too not shock the fish). Bettas are also different from most fish in that they do not require aeration. Bettas actually breathe from the air/water surface. Keep in mind, however, that you can only have one betta per bowl/tank. *If you get a female betta (shorter fins), you can sometimes keep more than one per bowl/tank, but keep in mind that should the fish begin to fight, you will have to have a second container to separate them."

"Katie"

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